I've been considering dragonborn warforged/warforged scout, as that would also be a great choice, and honestly the only reason I didn't write up my sheet that way is because they slipped my mind. I'd rather not go with strongheart halfling, but Azurin is also an interesting choice, but although it is mechanically sound, I'm not sold on it. Not to sound completely inept, but how much benefit would the extra essentia be?
Essentia is really difficult to get, but it'll benefit you the most if you throw resources into getting more of it (since essentia sources stack).
Currently dragonborn warforged (scout) sounds like it would be best. If I go with the dragonborn warforged, should I use the scout from MM3?
The regular warforged is 99% better than a scout. The Small size just doesn't make up for the ability penalities.
Eww.
Also, why the hell would a scout be purposefully built with a penalty to Wisdom?!
Edit: I'm 90% sure I'll go with the metacreativity focus, as that seems to be the one that suits the party and my tastes the best. The other 10% is towards psychometabolism, but I would only go that route if I was going to head into melee. Melee seems to be covered in the party, so I would likely only get in the way.
You can easily build a very effective character using nothing but Metacreativity powers; it's like Transmutation or Conjuration -- it's just that good.
But I wouldn't skip things like
dimension swap, psionic contingency, or
psychic reformation, especially if you're an erudite. They don't cost you much, given you have potentially unlimited powers known, and they'd be great even if you didn't. Also, note you can use multiple iterations of
psionic contingency and you can pair it up with
psychic reformation for a quickie rebuild when you need it. Expensive on the XP, but worth it when you need it.
Or just use Linked Power +
psychic reformation. Either/or.